[Nogwater]

Here's mine if anyone is interested. I wrote it in D and haven't looked at it in years. I'm sure it's not usable as-is, but it might be fun anyway.

https://github.com/nogwater/NetflixPrizeD

The algorithm is based on Simon Funk's blog post here: http://sifter.org/~simon/journal/20061211.html

For me, the best part was squeezing the data and indexes into memory. :)